Derville Rowland, the Central Bank’s director general of financial conduct, is due before the Joint Oireachtas Committee on Finance, Public Expenditure, and Reform today. Given the timing, much of her time is likely to be dedicated to the Central Bank’s investigation into the stockbroker Davy, a probe that resulted in a €4.1 million fine. The Central Bank deserves credit for its doggedness and its refusal to give in during its multi-year investigation into Davy, a probe led by Seána Cunningham, the Central Bank’s director of enforcement and anti-money laundering. It is a sign of how far the Central Bank has…